Properly Designed Modular Asymmetric Synthesis for Enantiopure Sulfinamide Auxiliaries from N-Sulfonyl-1,2,3-oxathiazolidine-2-oxide Agents
摘要:
Simple and practical asymmetric synthesis of functionally differentiated aminoindanol based endo-N-sulfonyl 1,2,3-oxathiazolidine-2-oxide as sulfinyl transfer agents are developed. The importance of these new and unique sulfinyl transfer reagents are exemplified by the expedient production of several sulfinamide ligands, including either enantiomer of (R)-tert-butanesulfinamide in excellent yields and enantiopurities.
Effective tuning of the arene and alkanesulfinamides for highly enantioselective synthesis of (S)-4-chlorophenylphenylmethylamine, a key intermediate for antihistamic (S)-cetirizine
作者:Zhengxu Han、Dhileepkumar Krishnamurthy、Paul Grover、Q.Kevin Fang、Derek A. Pflum、Chris H. Senanayake
DOI:10.1016/s0040-4039(03)00903-1
日期:2003.5
diastereoselectivity (>94%) has been achieved in the phenylMgBr addition process to chlorophenyl aldimine derived from the new and sterically hindered triisopropylbenzene sulfinamide (TIPBSA) in the synthesis of a key intermediate of (S)-Cetirizine. Surprisingly, under the same reaction conditions, toluenesulfinamide derived chlorophenyl aldimine provided only 10% ee.
Properly Designed Modular Asymmetric Synthesis for Enantiopure Sulfinamide Auxiliaries from <i>N</i>-Sulfonyl-1,2,3-oxathiazolidine-2-oxide Agents
作者:Zhengxu Han、Dhileepkumar Krishnamurthy、Paul Grover、Q. Kevin Fang、Chris H. Senanayake
DOI:10.1021/ja0200692
日期:2002.7.1
Simple and practical asymmetric synthesis of functionally differentiated aminoindanol based endo-N-sulfonyl 1,2,3-oxathiazolidine-2-oxide as sulfinyl transfer agents are developed. The importance of these new and unique sulfinyl transfer reagents are exemplified by the expedient production of several sulfinamide ligands, including either enantiomer of (R)-tert-butanesulfinamide in excellent yields and enantiopurities.
First Application of Tunable Alkyl or Aryl Sulfinamides to the Stereoselective Synthesis of a Chiral Amine: Asymmetric Synthesis of (<i>R</i>)-Didesmethylsibutramine ((<i>R</i>)-DDMS) Using (<i>R)</i>-Triethylmethylsulfinamide ((<i>R</i>)-TESA)
作者:Zhengxu Han、Dhileepkumar Krishnamurthy、Derek Pflum、Paul Grover、Stephen A. Wald、Chris H. Senanayake
DOI:10.1021/ol026699q
日期:2002.11.1
A highly diastereoselective addition of i-BuLi to a triethylmethylsulfinamide derived aldimine was used as the key step in the first asymmetric synthesis of (R)-didesmethylsibutramine, a metabolite of sibutramine for the potential treatment of CNS disorders. [reaction: see text]