Conversion of chiral amino acids to enantiomerically pure α-methylamines

Donner, B. G.

doi:10.1016/0040-4039(95)00039-f

Cited by 26 publications

(13 citation statements)

References 14 publications

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“…The racemates of 5 a , b, 5 d , e, 5 h ,33 5 c ,14 5 e, 5 g 24 and derivatives 6 a , b ,14 6 d ,20 6 f 14 have been reported earlier. Spectral data of the following compounds were in accordance with the literature: 2 a ,34 2 b ,35 2 d ,36 2 e ,37 2 h ,38 2 i ,39 2 j ,40 2 k ,41 2 l ,37 2 p ,42 9 a ,36 9 d ,36 9 e ,37 9 h ,43 9 i ,44 9 j ,45 9 l ,37 11 o 46. Experimental details on the synthesis and characterization of the following compounds are given in the Supporting Information: 2 a , b, d , e, h–l, p, 9 a, d , e, h , j, l and 11 o .…”

Section: Methodssupporting

confidence: 81%

Prediction‐based cluster management for target tracking in wireless sensor networks

Teng¹,

Snoussi²,

Richard³

2012

Wireless Communications

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The key impediments to a successful wireless sensor network (WSN) application are the energy and the longevity constraints of sensor nodes. Therefore, two signal processing oriented cluster management strategies, the proactive and the reactive cluster management, are proposed to efficiently deal with these constraints. The former strategy is designed for heterogeneous WSNs, where sensors are organized in a static clustering architecture. A non‐myopic cluster activation rule is realized to reduce the number of hand‐off operations between clusters, while maintaining desired estimation accuracy. The proactive strategy minimizes the hardware expenditure and the total energy consumption. On the other hand, the main concern of the reactive strategy is to maximize the network longevity of homogeneous WSNs. A Dijkstra‐like algorithm is proposed to dynamically form active cluster based on the relation between the predictive target distribution and the candidate sensors, considering both the energy efficiency and the data relevance. By evenly distributing the energy expenditure over the whole network, the objective of maximizing the network longevity is achieved. The simulations evaluate and compare the two proposed strategies in terms of tracking accuracy, energy consumption and execution time. Copyright © 2010 John Wiley & Sons, Ltd.

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Section: Methodssupporting

confidence: 81%

Prediction‐based cluster management for target tracking in wireless sensor networks

Teng¹,

Snoussi²,

Richard³

2012

Wireless Communications

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“…Spectral data of the following compounds were in accordance with the literature: 2 a, [34] 2 b, [35] 2 d, [36] 2 e, [37] 2 h, [38] 2 i, [39] 2 j, [40] 2 k, [41] 2 l, [37] 2 p, [42] 9 a, [36] 9 d, [36] 9 e, [37] 9 h, [43] 9 i, [44] 9 j, [45] 9 l, [37] 11 o. [46] Experimental details on the synthesis and characterization of the following compounds are given in the Supporting Information: 2 a, b, d, e, h ± l, p, 9 a, d, e, h, j, l and 11 o.…”

Section: Methodsmentioning

confidence: 99%

New Auxiliaries for Copper-Catalyzed Asymmetric Michael Reactions: Generation of Quaternary Stereocenters at Room Temperature

Christoffers

Mann

2001

Chem. Eur. J.

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Dialkyl amides of L-valine, L-isoleucine, and L-tert-leucine (2) are excellent chiral auxiliaries for the construction of quaternary stereocenters at ambient temperature. Enaminoesters 3, prepared from these auxiliaries 2 and Michael donors 1, undergo a copper-catalyzed asymmetric Michael reaction with methyl vinyl ketone (MVK, 4) to afford products 5 in 70-90% yield and 90-99% ee (enantiomeric excess). The exclusion of moisture or oxygen is not necessary. The auxiliaries 2 are readily available by standard procedures. After workup they can be recovered almost quantitatively.

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“…12 Without purification, 7 was hydrogenated to desulfurize with Raney nickel to produce 8. 13 introduction of small alkyl groups at the both 7-and 9-postions of 10-hydroxycamptothecin did not seem to bring expected much cytotoxicity enhancement compared with respective introduction of small alkyl goups at the 7-position or 9-position.…”

mentioning

confidence: 59%