Studies toward the total synthesis of 1-oxacephalosporins 3: synthesis of a (±)-trans-7-benzoylamino-3-carbamoyloxymethyl-1-oxa-3-cepheh-3-carboxylate from 1,3-dihydroxyacetone
作者:Hans Schmincke、Dieter Hoppe
DOI:10.1016/0040-4020(89)80100-0
日期:1989.1
strategy in the totalsynthesis of 1-oxacephalosporins the title compound 12 was constructed from 1,3-dihydroxy=acetone, methyl isocyanoacetate, and azidoacetyl chloride in 10 steps. Inter=mediates are the -formyl α,β-dehydroaminoacid ester 5, the 1,3-thiazoline-4-carboxylate 6, the -methyl thioformimidate 7, the 4-azido-3-methylthio-2-azetidinone 8 and the oxazolinoazetidinone 11. The synthesis also includes