Rh2(OAc)4-catalyzed reactions of α-diazoimides: a simple and novel synthesis of mono- and bis(2,3-fused perhydrooxazol-4-one) systemsElectronic supplementary information (ESI) available: experimental procedure and spectral data for compounds 2a–p, 3, 5a–f. See http://www.rsc.org/suppdata/cc/b2/b211717g/
π-Facial Diastereoselection in [3 + 2]-Cycloadditions of Isomünchnone Dipoles
摘要:
The Rh(II)-catalyzed reaction of 1-[diazo(methoxycarbonyl)acetyl]-2-oxopyrrolidine derivatives led to the formation of ring-fused isomunchnone betaines which are trapped with various dipolarophiles to give the corresponding [3 + 2]-cycloadducts in excellent yield. The cycloaddition reaction proceeded with high levels of diastereoselectivity leading to the predominant formation of the exo dipolar cycloadduct. The influence of substituents on the stereoselectivity of the reaction was investigated. Diastereotopic facial selectivity by the dipolarophile on the mesoionic betaine was found to depend upon the nature of the stereogenic center. Inclusion of substituents at any position of the fused five-membered ring was found to enhance exo selectivity. Isomunchnone dipoles derived from pyrrolidinones containing a carboalkoxy substituent in the 5-position of the ring afforded mainly exo-syn cycloadducts. In contrast, when a methyl group was present at the 3-position of the pyrrolidinone ring, the facial selectivity was reversed with the exo-anti adduct being the major product. A computational study was carried out to rationalize the observed product distribution.
Triphenylphosphine-mediated reactions of diazoimides in water were carried out under mild conditions to afford several triazine derivatives in high yields. We have demonstrated an environment friendly methodology to synthesize triazine derivatives. (C) 2009 Elsevier Ltd. All rights reserved.
Rh2(OAc)4-catalyzed reactions of α-diazoimides: a simple and novel synthesis of mono- and bis(2,3-fused perhydrooxazol-4-one) systemsElectronic supplementary information (ESI) available: experimental procedure and spectral data for compounds 2a–p, 3, 5a–f. See http://www.rsc.org/suppdata/cc/b2/b211717g/
Simply, trapping the intermediate isomünchnone 1,3-dipoles by the external oxygen nucleophiles resulted in new heterocyclic systems and the use of diols led to the formation of four carbon-oxygen bonds in a single operation which eventually delivered bis(2,3-fused perhydrooxazol-4-one) systems.
π-Facial Diastereoselection in [3 + 2]-Cycloadditions of Isomünchnone Dipoles
作者:Albert Padwa、Michael Prein
DOI:10.1021/jo970625o
日期:1997.10.1
The Rh(II)-catalyzed reaction of 1-[diazo(methoxycarbonyl)acetyl]-2-oxopyrrolidine derivatives led to the formation of ring-fused isomunchnone betaines which are trapped with various dipolarophiles to give the corresponding [3 + 2]-cycloadducts in excellent yield. The cycloaddition reaction proceeded with high levels of diastereoselectivity leading to the predominant formation of the exo dipolar cycloadduct. The influence of substituents on the stereoselectivity of the reaction was investigated. Diastereotopic facial selectivity by the dipolarophile on the mesoionic betaine was found to depend upon the nature of the stereogenic center. Inclusion of substituents at any position of the fused five-membered ring was found to enhance exo selectivity. Isomunchnone dipoles derived from pyrrolidinones containing a carboalkoxy substituent in the 5-position of the ring afforded mainly exo-syn cycloadducts. In contrast, when a methyl group was present at the 3-position of the pyrrolidinone ring, the facial selectivity was reversed with the exo-anti adduct being the major product. A computational study was carried out to rationalize the observed product distribution.