Diastereo- and enantioselective synthesis of 2,8-dioxabicyclo[3.3.0]octan-3-one derivatives
作者:Dieter Enders、Juan Vázquez、Gerhard Raabe
DOI:10.1039/a809611b
日期:——
An efficient asymmetric synthesis of 4-substituted (1S,4S,5R)-2,8-dioxabicyclo[3.3.0]octan-3-one derivatives (de 98%, ee = 80–>98%) in good overall yields is reported by a stepwise Michael addition–α-alkylation and subsequent hydrolytic domino reaction protocol employing formaldehyde SAMP-hydrazone as a neutral formyl anion equivalent and 5,6-dihydro-2H-pyran-2-one as a Michael acceptor.
以甲醛 SAMP-hydrazone 作为中性甲酰阴离子当量,5,6-二氢-2H-吡喃-2-酮作为迈克尔受体,通过逐步迈克尔加成-α-烷基化和随后的水解多米诺反应,高效不对称合成了 4-取代的 (1S,4S,5R)-2,8-二氧杂环[3.3.0]辛烷-3-酮衍生物(de 98%,ee = 80->98%),总产率良好。