Synthesis of 4-Oxo-3,4-dihydro-1<i>H</i>-thieno[3,4-<i>c</i>]- and thieno [3,2-<i>c</i>][1,2,6]thiadiazine 2,2-Dioxides
作者:Pilar Goya、Jaime Lissavetzky、Isabel Rozas
DOI:10.1055/s-1989-27222
日期:——
4-Oxo-3,4-dihydro-1H-thieno[3,4-c][1,2,6]thiadiazine 2,2-dioxide (3) has been synthesized in a two-step approach involving sulfamoylation of 3-amino-4-methoxycarbonylthiophene (1) and subsequent ring closure. A modification of this procedure, which involves isolation of the intermediate thiophenecarboxylic acid derivatives 4 and 9 has been used to prepare new 4-oxo-3,4-dihydro-1H-thieno[3,4-c]- and thieno[3,2-c][1,2,6]thiadiazine 2,2-dioxides 6 and 10 respectively.
4-氧代-3,4-二氢-1H-噻吩并[3,4-c][1,2,6]噻二嗪 2,2-二氧化物(3)是通过两步法合成的,包括 3-氨基-4-甲氧羰基噻吩(1)的磺酰化和随后的闭环。对这一过程进行了修改,分离出中间体噻吩甲酸衍生物 4 和 9,分别用于制备新的 4-氧代-3,4-二氢-1H-噻吩并[3,4-c]-和噻吩并[3,2-c][1,2,6]噻二嗪 2,2- 二氧化物 6 和 10。