Oxazoline N-Oxide-Mediated [2 + 3] Cycloadditions: Application to a Total Synthesis of the Hypocholesterolemic Agent 1233A
摘要:
Oxetanone 1233A1 has been synthesized in 22 steps and 3.43% overall yield from 3-methylglutaric anhydride. Asymmetric carbon at C-7 was introduced by a diastereoselective esterification of 3-methylglutaric anhydride, whereas the two asymmetric carbons at C-2' and C-3' were controlled by an asymmetric [2 +/- 3] cycloaddition using camphor-derived oxazoline N-oxide as dipole.
Oxazoline N-Oxide-Mediated [2 + 3] Cycloadditions: Application to a Total Synthesis of the Hypocholesterolemic Agent 1233A
摘要:
Oxetanone 1233A1 has been synthesized in 22 steps and 3.43% overall yield from 3-methylglutaric anhydride. Asymmetric carbon at C-7 was introduced by a diastereoselective esterification of 3-methylglutaric anhydride, whereas the two asymmetric carbons at C-2' and C-3' were controlled by an asymmetric [2 +/- 3] cycloaddition using camphor-derived oxazoline N-oxide as dipole.
Oxazoline <i>N</i>-Oxide-Mediated [2 + 3] Cycloadditions: Application to a Total Synthesis of the Hypocholesterolemic Agent 1233A
作者:Olivier Dirat、Cyrille Kouklovsky、Yves Langlois
DOI:10.1021/jo980813u
日期:1998.9.1
Oxetanone 1233A1 has been synthesized in 22 steps and 3.43% overall yield from 3-methylglutaric anhydride. Asymmetric carbon at C-7 was introduced by a diastereoselective esterification of 3-methylglutaric anhydride, whereas the two asymmetric carbons at C-2' and C-3' were controlled by an asymmetric [2 +/- 3] cycloaddition using camphor-derived oxazoline N-oxide as dipole.