Synthesis of Chiral Pyrrolo[1,2-<i>c</i>]thiazoles via Intramolecular Dipolar Cycloaddition of Münchnones: An Interesting Rearrangement to Pyrrolo[1,2-<i>c</i>]thiazines
作者:Teresa M. V. D. Pinho e Melo、Maria I. L. Soares、António M. d'A. Rocha Gonsalves,、José A. Paixão、Ana M. Beja、Manuela Ramos Silva、Luiz Alte da Veiga、João Costa Pessoa
DOI:10.1021/jo010807p
日期:2002.6.1
Intramolecular dipolar cycloaddition of bicyclic münchnones, 5H,7H-thiazolo[3,4-c]oxazol-4-ium-1-olates, derived from cyclodehydration of 2-substituted-N-acylthiazolidine-4-carboxylic acids are reported. A range of new pyrrolo[1,2-c]thiazole derivatives (7, 14, 15, 20, 23, and 26) were obtained as single enantiomers from 2-phenylthiazolidines, 2-benzoylthiazolidines, and 2-methylthiazolidine-4-carboxylates
报道了由2-取代的-N-酰基噻唑烷-4-羧酸的环脱水作用得到的双环慕尼黑化合物,5H,7H-噻唑并[3,4-c]恶唑-4--1-油酸酯的分子内偶极环加成反应。从2-苯基噻唑烷,2-苯甲酰基噻唑烷和2-甲基噻唑烷-4-羧酸盐中获得了一系列新的吡咯并[1,2-c]噻唑衍生物(7、14、15、20、23和26)作为单一对映体。吡咯并[1,2-c] [1,4]噻嗪衍生物27也从吡咯并[1,2-c]噻唑衍生物26获得。甲基(2R,4R)-2-(对甲氧基苯甲酰基)噻唑烷的结构-4-羧酸酯(17a),甲基(2R,4R)-2-(对甲氧基苯甲酰基)-N-(丙-2-炔氧基乙酰基)噻唑烷-4-羧酸酯(18)和3-氧代-4-苯基-通过X射线晶体学测定3,4,6,8-四氢-1H-呋喃[3',4':2,3]吡咯并[1,2-c] [1,4]噻嗪(27)。