Simple Stereoselective Synthesis of Unsaturated Lactone Intermediates and Their Conversion into Natural Dihydropyranones and Their Enantiomers#
作者:Digambar Balaji Shinde、Boddu Shashi Kanth、Avula Satyakumar、V.T. Kamble、Biswanath Das
DOI:10.2174/1570178611310050003
日期:2013.5.1
The stereoselective synthesis of the unsaturated lactone intermediates, (S) - and (R)-2-(6-oxo-3, 6-dihydro-2Hpyran- 2-yl) acetaldehydes has been accomplished from propane 1,3 diol employing Maruoka asymmetric allylation and ring closing metathesis reaction. The intermediates were converted into two natural dihydropyranones, 6 (R)-4-oxopent-2- enyl 5,6-dihydro-2H-pyran-2-one and (R)- rugulactone and
立体选择性合成不饱和内酯中间体(S)-和(R)-2-(6-oxo-3,6-二氢-2Hpyran-2-基)乙醛的反应是使用Maruoka不对称丙烷1,3二醇完成的烯丙基化和闭环易位反应。中间体通过维蒂希(Wittig)烯化反应转化为两种天然的二氢吡喃酮,即6(R)-4-氧opent-2-烯基5,6-二氢-2H-吡喃-2-酮和(R)-丁二内酯及其对映异构体。