Asymmetric synthesis of carbocycles: use of intramolecular conjugate displacement
作者:Dinesh T. Sreedharan、Derrick L. J. Clive
DOI:10.1039/c3ob40115d
日期:——
Intramolecular conjugate displacement (ICD), the process illustrated in eqn (1), has been applied to the Morita–Baylis–Hillman adducts formed from (5S)-5-(L-menthyloxy)-2(5H)-furanone and aldehydes that are substituted in the γ- or δ-position by geminal phenylthio groups. When the initial Morita–Baylis–Hillman alcohols are acetylated and oxidized to geminal sulfones, deprotonation causes ring closure
分子内共轭置换(ICD),过程说明如下 eqn(1),已被应用于Morita-Baylis-Hillman加成物,由 (5 S)-5-(L-薄荷氧基)-2(5 H)-呋喃酮和在γ或δ位被双苯硫基取代的醛。当最初的Morita–Baylis–Hillman醇被乙酰化并氧化为双砜时,去质子化会导致ICD闭环(2.5→2.6)。氢化,DIBAL-H还原和去磺酰化释放出光学上纯净的碳环。