Total Synthesis of (±)-3-Deoxy-7,8-dihydromorphine, (±)-4-Methoxy-N-methylmorphinan-6-one and 2,4-Dioxygenated (±)-Congeners
作者:Fu-Lian Hsu、Kenner C. Rice、Arnold Brossi
DOI:10.1002/hlca.19820650531
日期:1982.7.28
A total synthesis of racemic 3-deoxy-7,8-dihydromorphine ((±)-2) and 4-me-thoxy-ALmethylmorphinan-6-one ((±)-3) is described. The key intermediate was 2,4-dihydroxy-N-formylmorphinan-6-one (11), obtained from 3,5-dibenzyloxy-phenylacetic acid (4) in 41.8% overall yield. Bromination of 11, and treatment with aqueous NaOH-solution afforded, after N-deblocking and reductive N-methylation with concomitant
描述了外消旋的3-脱氧-7,8-二氢吗啡((±)-2)和4-甲氧基-AL甲基吗啡喃-6-一((±)-3)的全合成。关键中间体是2,4-二羟基-N-甲酰基吗啡喃-6-一(11),由3,5-二苄氧基-苯乙酸(4)获得,总收率为41.8%。进行11的溴化和N的OH溶液处理,然后进行N脱嵌段和还原性N甲基化,并同时除去芳族结合的Br原子吗啡酮14。消除了HO–C(2)基团14是通过氢解其N-苯基四唑基醚15,得到3-脱氧-6,0-二脱氢-7,8-二氢吗啡(16)。在低温下用L-Selectride还原16可获得高产(±)-2。在更剧烈的还原条件下,醚15直接提供4-羟基-N-甲基吗啡喃6-1 (17)。在17的O-甲基化之后,获得甲基醚(±)-3。4-羟基-2-甲氧基-N-甲基mor-phinan-6-one (28)及其2-羟基-4-甲氧基异构体30的(1:1)混合物svere通过类似于这提供一