Synthetic study of amino-sugars from pyridines. V. Synthesis of 5-amino-5-deoxypiperidinoses from the singlet oxygen adduct of 1-acyl-1,2-dihydropyridines.
作者:MITSUTAKA NATSUME、MORITAKA WADA、MASASHI OGAWA
DOI:10.1248/cpb.26.3364
日期:——
Sensitized photooxidation of 5-cyano-1, 2-dihydropyridine derivative (3) afforded a crystalline and reactive endo-peroxide (4), and sulfur derivatives (5 and 6) as well as oxygen derivatives (9 and 10) were produced in good yield from this singlet oxygen adduct (4). 2-Methoxy derivative (9b) was found to be a good intermediate for production of 4-substituted compounds such as 5, 6, 7, 8, and 10, and 1-O-methyl-5-benzamido-5-deoxy-allopiperidinose (15a) and 1-O-methyl-5-benzamido-5-deoxyaltropiperidinose (17a) were synthesized from 13, which was obtained by the cis-dihydroxylation reaction of 9b. Formation of 9 from 4 was proved to be a multi-step reaction through 23 and 26.
对 5-氰基-1, 2-二氢吡啶衍生物 (3) 进行敏化光氧化反应,可得到一种结晶的活性内过氧化物 (4),并从这种单线态氧加成物 (4) 中制备出硫衍生物 (5 和 6) 以及氧衍生物 (9 和 10),收率很高。发现 2-甲氧基衍生物(9b)是生产 4-取代化合物(如 5、6、7、8 和 10)的良好中间体,而 1-O-甲基-5-苯甲酰胺-5-脱氧-阿洛哌啶糖(15a)和 1-O-甲基-5-苯甲酰胺-5-脱氧-阿洛哌啶糖(17a)是由 13 合成的,13 是通过 9b 的顺式二羟基反应得到的。通过 23 和 26,证明由 4 生成 9 是一个多步骤反应。