Judicious Application of Allyl Protecting Groups for the Synthesis of 2-Morpholin-4-yl-4-oxo-4<i>H</i>-chromen-8-yl Triflate, a Key Precursor of DNA-Dependent Protein Kinase Inhibitors
作者:Sonsoles Rodriguez Aristegui、Marine Desage El-Murr、Bernard T. Golding、Roger J. Griffin、Ian R. Hardcastle
DOI:10.1021/ol062297x
日期:2006.12.1
[Structure: see text] 2-morpholin-4-yl-4-oxo-4H-chromen-8-yl 2,2,2-trifluoromethanesulfonate is a key intermediate for the synthesis of the DNA-dependent protein kinase (DNA-PK) inhibitor 8-dibenzothiophen-4-yl-2-morpholin-4-yl-chromen-4-one (NU7441). Two improved methods for the synthesis of this triflate have been developed: (A) in 35% overall yield, through modification of the published route, and (B)
[结构:见正文] 2-吗啉-4-基-4-氧代-4H-铬n-8-基2,2,2-三氟甲磺酸盐是合成DNA依赖性蛋白激酶(DNA-PK)的关键中间体)抑制剂8-二苯并噻吩-4-基-2-吗啉-4-基-铬基-4-酮(NU7441)。已开发出两种改进的合成三氟甲磺酸酯的方法:(A)通过修饰已公开的路线使总收率达到35%,(B)通过采用Baker-Venkataraman重排反应的新路线来提高总收率15%。能够生成色酮支架。两种合成都取决于对烯丙基保护基的明智使用。