Organocatalytic Domino Double Michael Reaction of Ethyl (E)-7-Oxohept-2-enoate and α,β-Unsaturated Aldehydes: Efficient Asymmetric Synthesis of Cyclohexanes with Four Contiguous Stereocenters
作者:Bor-Cherng Hong、Amit Sadani、Roshan Nimje、Nitin Dange、Gene-Hsiang Lee
DOI:10.1055/s-0030-1260469
日期:2011.6
Organocatalytic domino double Michael reactions of ethyl (E)-7-oxohept-2-enoate and α,β-unsaturated aldehydes provided ethyl 2-(2,4-diformyl-3-phenylcyclohexyl)acetate with excellent diastereoselectivities (>20:1 dr) and enantioselectivities (>99% ee). The adducts were further transformed to octahydro-3H-2-benzopyran-3-ones, octahydroisoquinolin-3(2H)-ones, and decahydro-5H-oxazolo[2,3-a]isoquinolin-5-ones
(E)-7-氧杂庚-2-烯酸酯和α,β-不饱和醛的有机催化多米诺双Michael反应提供了具有出色的非对映选择性(> 20:1 dr的2-(2,4-二甲酰基-3-苯基环己基)乙酸乙酯)和对映选择性(> 99%ee)。将加合物进一步转化为八氢-3 H -2-苯并吡喃-3-酮,八氢异喹啉-3(2 H)-酮和十氢-5 H-恶唑并[2,3 - a ]异喹啉-5-酮。 迈克尔加成-醛-有机催化-醛醇缩合反应-喹啉