Untersuchungen über »Santalol.«

Semmler, F. W.; Bode, K.

doi:10.1002/cber.190704001168

Cited by 27 publications

(30 citation statements)

References 3 publications

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“…5 Hz, 1 H, 1-H), 3.88 (s, 2 H, CH 2 O), 6.37-6.39 (m, 1 H, C=CH). 13 C 80.85, H 7.93, N 5.24; found C 80.74, H 7.66, N 5.26. …”

Section: (-)-(1r)-tert-butyl 66-dimethylbicyclo[311]hept-2-ene-2-cmentioning

confidence: 93%

“…Melting points were determined in open glass capillaries and are not corrected. If not stated otherwise, 1 H and 13 [22] were used.…”

Section: Methodsmentioning

confidence: 99%

“…C 74.55,H 9.93,N 7.25;found C 74.28,H 9.89,N 7.20. 13 = 5.9, J 5,7b = 5.9 Hz, 1 H, 7-H b ), 2.68 (ddd, J 1, 5 = 5.7, J 1,7b = 5.7, J 1,3 = 1. 5 5 H,.…”

Section: (-)-(1r)-tert-butyl 66-dimethylbicyclo[311]hept-2-ene-2-cmentioning

confidence: 98%

“…The synthesis of myrtenic acid (3) (Scheme 5) followed a route described by Semmler, [13] starting from commercially available (1R)-myrtenal (1) by oxime formation, dehydratisation of this to give the nitrile 2 and subsequent hydrolysis. For the hydrolysis of nitrile 2 to give acid 3 we obtained superior results by modifying the original procedure and use of alkaline aqueous hydrogen peroxide solution under reflux (97 % yield).…”

Section: Synthesis Of the Requisite αβ-Unsaturated Carboxylic Acid Dmentioning

confidence: 99%

“…The reaction mixture was then neutralized by addition of 2 n NaOH (900 mL) and extracted with diethyl ether (5 × 150 mL). The combined organic layers were dried over Na 2 SO 4 13 Nitrile 2 (10.00 g, 67.9 mmol) was added at 0°C to a stirred solution of sodium hydroxide (8.00 g, 200 mmol) in aqueous hydrogen peroxide (10 %, 150 mL). After stirring for 3 h at room temperature the solution was heated at reflux for 4 d. After cooling to room temperature the mixture was extracted with diethyl ether and the organic phase discarded.…”

Section: General Procedures For Amide Formation (Gp 3)mentioning

confidence: 99%

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Syntheses of New Chiral Phosphane Ligands by Diastereoselective Conjugate Addition of Phosphides to Enantiomerically Pure Acceptor‐Substituted Olefins from the Chiral Pool

et al. 2005

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A variety of new chiral phosphanes were prepared by highly diastereoselective additions of phosphanes to α,β-unsaturated carbonyl compounds and related acceptor-substituted olefins derived from myrtenal as ex chiral pool source. Monophosphanes with astereogenic as well as stereogenic phos-[a] Organisch-Jansen and Feringa who employed this approach for a synthesis of the ligand chiraphos using as key steps diastereoselective addition of lithium diphenylphosphide to a γ-alkoxybutenolide and trapping of the resulting enolate with PPh 2 Cl (Scheme 2). [6] Scheme 2. Asymmetric synthesis of chiraphos via conjugate addition.Afterwards, the concept of the diastereoselective conjugate addition of phosphides as a simple route to novel ligands was further elaborated in our group. In contrast to Jansen and Feringa we directly used the addition products as ligands and selected the chiral starting materials from ex chiral pool sources in order to assure enantiomeric purity and relative configuration of the new phosphane ligands. In this way it was possible to obtain enantiomerically pure trans-3-(diphenylphosphanyl)myrtanic acid [7] in only two steps: addition of lithium diphenylphosphide to tert-butyl myrtenate which is easily accessible from commercial, cheap myrtenal followed by cleavage of the ester (Scheme 3). [8] In the meantime related diastereoselective conjugate additions to EWG-substituted olefins to give enantiomerically pure P,N-ligands were described by Knochels group. [9] Further-New Chiral Phosphane Ligands FULL PAPER more, enantioselective additions of phosphanes under control of asymmetric catalysts have been achieved by Togni et al. [10] Scheme 3. Synthesis of trans-3-(diphenylphosphanyl)myrtanic acid, an excellent ligand for Pd-catalyzed allylic substitutions, by diastereroselective conjugate addition.trans-3-(Diphenylphosphanyl)myrtanic acid is an excellent ligand for Pd-catalyzed allylic substitutions. [11] Minami et al. described an alternative approach to enantiomerically pure β-phosphanylcarboxylic acids via a multi-step synthesis of a racemate followed by enantiomer resolution by crystallization of diastereomeric salts. [12] Both the butenolide-derived as well as the myrtane-based system impressively demonstrate that phosphane additions on such rigid, cyclic cores proceed with a high degree of diastereoselectivity and at a high reaction rate. The almost unlimited availability of a large variety of enantiomerically pure enones, enoates and enals, therefore, offers the possibility to generate libraries of structurally diverse ligands. This consideration and the high efficiency of trans-3-(diphenylphosphanyl)myrtanic acid as ligand in Pd-catalyzed allylic alkylation reactions [8] prompted us to examine the conjugate addition more thoroughly. To begin with, the following aspects were most relevant:1. The torsion angle between the phosphanyl and the carboxyl group of phosphanylcarboxylic acids can be systematically varied by choosing appropriate conjugated acceptors. As shown in Scheme 4 phosphanylcarbo...

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“…5 Hz, 1 H, 1-H), 3.88 (s, 2 H, CH 2 O), 6.37-6.39 (m, 1 H, C=CH). 13 C 80.85, H 7.93, N 5.24; found C 80.74, H 7.66, N 5.26. …”

Section: (-)-(1r)-tert-butyl 66-dimethylbicyclo[311]hept-2-ene-2-cmentioning

confidence: 93%

“…Melting points were determined in open glass capillaries and are not corrected. If not stated otherwise, 1 H and 13 [22] were used.…”

Section: Methodsmentioning

confidence: 99%

“…C 74.55,H 9.93,N 7.25;found C 74.28,H 9.89,N 7.20. 13 = 5.9, J 5,7b = 5.9 Hz, 1 H, 7-H b ), 2.68 (ddd, J 1, 5 = 5.7, J 1,7b = 5.7, J 1,3 = 1. 5 5 H,.…”

Section: (-)-(1r)-tert-butyl 66-dimethylbicyclo[311]hept-2-ene-2-cmentioning

confidence: 98%

Section: Synthesis Of the Requisite αβ-Unsaturated Carboxylic Acid Dmentioning

confidence: 99%

Section: General Procedures For Amide Formation (Gp 3)mentioning

confidence: 99%

See 3 more Smart Citations

Syntheses of New Chiral Phosphane Ligands by Diastereoselective Conjugate Addition of Phosphides to Enantiomerically Pure Acceptor‐Substituted Olefins from the Chiral Pool

et al. 2005

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Zur Kenntnis der Bestandteile ätherischer Öle. (Über die im ostindischen Sandelholzöl vorkommenden Sesquiterpene)

Semmler¹

1907

Ber. Dtsch. Chem. Ges.

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Zur Kenntnis der Bestandteile ätherischer Öle. (Weitere Mitteilungen ü die Santalole C₁₅H₂₄O und ihre Derivate

Semmler¹

1908

Ber. Dtsch. Chem. Ges.

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Untersuchungen über »Santalol.«

Cited by 27 publications

References 3 publications

Syntheses of New Chiral Phosphane Ligands by Diastereoselective Conjugate Addition of Phosphides to Enantiomerically Pure Acceptor‐Substituted Olefins from the Chiral Pool

Syntheses of New Chiral Phosphane Ligands by Diastereoselective Conjugate Addition of Phosphides to Enantiomerically Pure Acceptor‐Substituted Olefins from the Chiral Pool

Zur Kenntnis der Bestandteile ätherischer Öle. (Über die im ostindischen Sandelholzöl vorkommenden Sesquiterpene)

Zur Kenntnis der Bestandteile ätherischer Öle. (Weitere Mitteilungen ü die Santalole C₁₅H₂₄O und ihre Derivate

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Untersuchungen über »Santalol.«

Cited by 27 publications

References 3 publications

Syntheses of New Chiral Phosphane Ligands by Diastereoselective Conjugate Addition of Phosphides to Enantiomerically Pure Acceptor‐Substituted Olefins from the Chiral Pool

Syntheses of New Chiral Phosphane Ligands by Diastereoselective Conjugate Addition of Phosphides to Enantiomerically Pure Acceptor‐Substituted Olefins from the Chiral Pool

Zur Kenntnis der Bestandteile ätherischer Öle. (Über die im ostindischen Sandelholzöl vorkommenden Sesquiterpene)

Zur Kenntnis der Bestandteile ätherischer Öle. (Weitere Mitteilungen ü die Santalole C15H24O und ihre Derivate

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Zur Kenntnis der Bestandteile ätherischer Öle. (Weitere Mitteilungen ü die Santalole C₁₅H₂₄O und ihre Derivate