Stereoselective synthesis of 2-alkylidene-3,4-dihydro-3-oxo-2h-1,4-benzothiazines
作者:F. Babudri、L. Di Nunno、S. Florio
DOI:10.1016/0040-4020(82)80193-2
日期:1982.1
reaction with aldehydes leads to diastereomeric aldols 4 and 5. Acetylation followed by acetic acid elimination of the aldols provides a stereoselective and high yield route to 2-alkylidene-3,4-dihydro-3-oxo-2H-1,4-benzothiazines.
4-甲基-3,4-二氢-3-氧代--2H-1,4-苯并噻嗪与LDA的金属化以及随后与醛的反应导致生成非对映异构醇醛4和5。乙酰化,然后消除醛醇的乙酸为2-亚烷基-3,4-二氢-3-氧代-2H-1,4-苯并噻嗪提供了立体选择性和高产率的途径。