Study for diastereoselective aldol reaction in flow: synthesis of (E)-(S)-3-hydroxy-7-tritylthio-4-heptenoic acid, a key component of cyclodepsipeptide HDAC inhibitors
作者:Takayuki Doi、Hiroyuki Otaka、Koji Umeda、Masahito Yoshida
DOI:10.1016/j.tet.2015.05.051
日期:2015.9
Flow synthesis of (E)-(S)-3-hydroxy-7-tritylthio-4-heptenoic acid (5), a key component of cyclodepsipeptide histone deacetylase inhibitors was achieved. An efficient flow system for the synthesis of α, β-unsaturated ester 8 was established using a flow reactor column packed with polymer-supported 1,4-diazabicyclo[2.2.2]octane and a fast mixing accessible flow reactor (Comet X-01). Enal 9 was efficiently
实现了环二肽组蛋白脱乙酰基酶抑制剂的关键成分(E)-(S)-3-羟基-7-三苯硫基-4-庚烯酸(5)的流式合成。使用装有聚合物支撑的1,4-二氮杂双环[2.2.2]辛烷的流动反应器色谱柱和快速混合的流动反应器(Comet X-01),建立了用于合成α,β-不饱和酯8的高效流动系统。)。通过在流动系统中使用氢化二异丁基铝将α,β-不饱和酯8部分还原而有效地制备了烯醛9,并在低温下进行了连续流非对映选择性醇醛缩合反应,从而获得了所需醛醇的良好收率和非对映选择性10。