A New Synthesis of Ciliapterin and Dictyopterin. Ene Reactions of (Alkenylamino)-nitroso-pyrimidines
作者:Fang-Li Zhang、Andrea Vasella
DOI:10.1002/hlca.200890255
日期:2008.12
A comparison of the reactivity of (acylamino)-nitroso-pyrimidines 1 and the alkenylamino analogue 17 in intramolecular ene reactions showed the considerably lower reactivity of 17, leading to the pteridine 18. Pteridin-7-one 11 resulting from 1 (R1=OBn, R2=Me) was transformed into 4-(benzyloxy)-6-[(E)-prop-1-enyl]pteridin-2-amine (13) by O-triflation, followed by reduction with LiBHEt3, while the 4-MeO
在分子内烯反应中,(酰基氨基)-亚硝基-嘧啶1和烯基氨基类似物17的反应性比较表明,17的反应性相当低,导致蝶啶18。由1(R 1 = OBn,R 2 = Me)得到的蝶呤-7-1 11被转化为4-(苄氧基)-6-[[(E)-丙-1-烯基]蝶啶-2-胺(13)通过O - triflation,然后用LiBHEt 3还原,而4-MeO类似物18是通过自发氧化17的初始烯产物制备的。的(烯基)亚硝基-嘧啶17是由二甲亚硝基嘧啶的合成取代16与烯丙胺15。通过蝶呤18的Sharpless不对称二羟基化反应合成了纤毛蛋白(5)和双翅蝶呤(7)。