作者:Emmanuel A. Adegoke、Babajide I. Alo、Oluwole B. Familoni
DOI:10.1002/jhet.5570240122
日期:1987.1
Regiospecific synthesis of 4H-3,3a-dihydrothiazolo[4,3-b]quinazolines and 7-methyl-4H-3,3a-dihydrothiazolo[4,3-b]quinazolines IVa and IVb is described. The N-substituted thiazolidinecarboxylic acids Ia and Ib were converted to the corresponding acid chlorides, IIa and IIb but neither reacted with silver trifluoromethanesulphonate. The carboxylic acids Ic and Id were however, decarboxylated to the corresponding
描述了4 H -3,3a-二氢噻唑并[4,3- b ]喹唑啉和7-甲基-4 H -3,3a-二氢噻唑并[4,3- b ]喹唑啉IVa和IVb的区域特异性合成。所述Ñ取代噻唑烷酸IA和磅被转化为相应的酰基氯,IIA和IIB但既不与三氟甲磺酸银反应。但是,使用三氯氧化磷将羧酸Ic和Id脱羧成相应的亚胺离子,得到了硝胺IIIa和IIIb。还原环化产生喹唑啉IVa和IVb。