Acrolein acetals as allyl cation precursors in the ionic Diels-Alder reaction

Diastereoselective Total Synthesis of (±)‐Schindilactone A

“…Notably, when the diastereoisomers of 15 were treated with a catalytic amount (10 mol %) of the Grubbs II catalyst in the presence of MgBr 2 (20 mol %) at 30 8C for 6 hours, 16 was generated as the sole isomer in 65 % yield. This observed MgBr 2 -mediated in situ epimerization [22] was in line with the results reported by Scholl and Grubbs. [23] The structure of 16 has been established by X-ray crystallographic analysis.…”

Cationic Gold(I)‐Catalyzed Intermolecular [4+2] Cycloaddition between Dienes and Allenyl Ethers

“…[9] In 2007, Zhang established an intramolecular [3 + 2] cycloaddition of allenyl MOM ethers and enones/enals towards a cyclopentanone enol ether containing an all-carbon quaternary center. In the rationale, a selective AuA C H T U N G T R E N N U N G (III) activation of the allenyl ether moiety to form an oxocarbenium species was proposed.…”

Concomitant Addition and Acetalization of α,β‐Unsaturated Aldehydes with Diols.

“…They are useful in olefin cross methathesis, 2,3 as dienophiles, [4][5][6] as dipolarophiles, 7,8 and in C-C bond formation by umpolung addition. [9][10][11] They are also important in polymer research.…”