3,4-二氧-2H-萘-1-酮与盐酸羟胺反应后,在PPA中经Beckmann重排、碘代得到3-碘代-2,3,4,5-四氢-1H-[1]-2-氧代苯并氮杂革(5),5经氨解、D-焦谷氨酸拆分、浓氨水处理后催化氢化还原,得到(R)-3-氨基-2,3,4,5-四氢-1H-[1]-2-氧代苯并氮杂革,总收率约44%,纯度98%,ee值99.5%。
(R) -3-Amino-2,3,4,5-tetrahydro- 1H- [ 1 ]-2-oxobenzazepin was synthesized by reaction from 3,4-dihydro-2H-naphthalen-1-one by reaction with hydroxylamine hydrochloride, Beckmann rearrangement in PPA and iodination with HMDS/I2 to give 3-iodo-2,3,4,5-tetrahydro-lH-[1]-2-oxobenzazepin, which was subjected to ammonolysis, resolution with D-pyroglutamic acid, treatment with NH3·H2O and then catalytic hydrogenated reduction. The overall yield was about 44%, with 98% purity and 99.5% ee.