New Efficient Synthesis of 5-Ethoxyoxazoles and Oxazolo[3,2-c]quinazolines via Aza-Wittig Reaction
作者:Ming-Wu Ding、Nian-Yu Huang、Yi-Bo Nie
DOI:10.1055/s-0028-1087562
日期:2009.3
5-Ethoxyoxazoles or 2-acylamino propanoates were synthesized by aza-Wittig reaction of iminophosphorane with acyl chloride in the presence of triethylamine. Reactions of 5-alkoxyoxazole with triphenyphosphine produced iminophosphoranes. A tandem aza-Wittig reaction of iminophosphorane with isocyanate or carbon disulfide generated oxazolo[3,2-c]quinazolines in satisfactory yields.
在三乙胺存在下,通过亚氨基正膦与酰氯的氮杂维蒂希反应合成5-乙氧基恶唑或2-酰氨基丙酸酯。 5-烷氧基恶唑与三苯基膦反应生成亚氨基正膦。亚氨基正膦与异氰酸酯或二硫化碳的串联氮杂维蒂希反应生成恶唑并[3,2-c]喹唑啉,产率令人满意。