High-Yield Synthesis of Fluorinated Benzothiazolyl Sulfones: General Synthons for Fluoro-Julia Olefinations
作者:Arun K. Ghosh、Barbara Zajc
DOI:10.1021/ol060002+
日期:2006.4.1
[reaction: see text] General, high-yield tandem electrophilic fluorination and modified Julia olefination for the synthesis of fluoro olefins is reported. A series of alpha-fluoro 1,3-benzothiazol-2-yl sulfone-based synthons were synthesized via deprotonation-fluorination. Of critical importance for high-yield fluorinations were heterogeneous reaction conditions, as under homogeneous conditions only
[反应:见正文]报道了用于合成氟烯烃的一般的高产率串联亲电氟化反应和改性的朱莉娅烯化反应。通过去质子氟化反应合成了一系列基于α-氟1,3-苯并噻唑-2-基砜的合成子。对于高产率氟化而言,至关重要的是非均相反应条件,因为在均相条件下仅回收了起始砜。将如此获得的α-氟1,3-苯并噻唑-2-基砜与各种醛和酮进行缩合反应,以提供高产率的区域特异性氟化烯烃。