3-Methoxycarbonyl-2-N-methyl-1,2,5-benzothiadiazepine 1,1-dioxide 2b can be obtained in seven unambiguous steps starting from commercially available l-serine methyl ester. The crucial step in the synthesis of 2b is the intramolecular Michael addition of dehydroalanine derivative 17, which can be achieved using sodium tert-butoxide as a non-nucleophilic base. An initial attempt to construct the same
3-甲氧羰基-2-
N-甲基-1,2,5-苯并噻二氮杂1,1,2-二氧化物2b可以从市售的1-
丝氨酸甲酯开始的七个明确步骤中获得。合成2b的关键步骤是脱氢丙
氨酸衍
生物17的分子内迈克尔加成,这可以使用
叔丁醇钠作为非亲核碱来实现。最初的尝试是通过另一种策略构建相同的支架,该策略基于亲核芳香族取代作为关键的闭环步骤,但未成功。