Asymmetric synthesis of α-substituted nitriles and cyanohydrins by oxidative cleavage of chiral aldehyde hydrazones with magnesium monoperoxyphthalate
作者:Dieter Enders、Andrew Plant、Dirk Backhaus、Ulrich Reinhold
DOI:10.1016/0040-4020(95)00647-q
日期:1995.9
Optically active α- and α,β-substituted aldehyde hydrazones 2, 4, and 7, which are readily available by asymmetric alkylation. Michael addition or [2,3]-Wittig rearrangement of chiral hydrazones can be transformed into nitriles 3 and 5 or cyanohydrins 8 by MMPP mediated oxidation, respectively. This synthetic sequence offers a C-C connective entry into optically active functionalised nitriles with
旋光性的α-和α,β-取代的醛2、4和7可以通过不对称烷基化轻松获得。手性的迈克尔加成或[2,3] -Wittig重排可通过MMPP介导的氧化分别转化为腈3和5或氰醇8。该合成序列可CC连接进入旋光官能化的腈,具有良好的总收率(30%至75%),以及非对映和对映选择性高(de =76-≥96%,ee 72-≥97%)。