DIELS-ALDER REACTION OF (S)-2-P-TOLYLSULFINYL-2-CYCLOPENTENONE WITH DANES DIENE - AN EFFICIENT APPROACH TO THE ENANTIOSELECTIVE PREPARATION OF PERHYDRO-CYCLOPENTA[A]PHENANTHRENES
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作者:
ALONSO, I
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机构:UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
ALONSO, I
CARRETERO, JC
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机构:UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
CARRETERO, JC
RUANO, JLG
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机构:UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
RUANO, JLG
CABREJAS, LMM
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机构:UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
CABREJAS, LMM
LOPEZSOLERA, I
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机构:UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
LOPEZSOLERA, I
RAITHBY, PR
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机构:UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
RAITHBY, PR
机构:
[1] UNIV AUTONOMA MADRID, DEPT QUIM ORGAN C1, E-28049 MADRID, SPAIN
[2] UNIV CAMBRIDGE, CHEM LAB, CAMBRIDGE CB2 1EW, ENGLAND
The reactions of (S)-2-p-tolylsulfinyl-2-cyclopentenone with Dane's diene catalyzed by EtAlCl(2) yields adducts easily desulfinylated into optically pure perhydro-cyclopenta[a]phenanthrenes. The endo- (controlled by CO group) and regio- (controlled by the substituent at C-2 of diene) selectivities of the asymmetric Diels-Alder reaction are complete. The pi-facial selectivity is also very high and dependent on both the sulfinyl configuration and the amount of EtAlCL(2) used.