An Efficient Fischer Indole Synthesis of Avitriptan, a Potent 5-HT<sub>1D</sub> Receptor Agonist
作者:Paul R. Brodfuehrer、Bang-Chi Chen、Thomas R. Sattelberg、Patrick R. Smith、Jayachandra P. Reddy、Derron R. Stark、Sandra L. Quinlan、J. Gregory Reid、John K. Thottathil、Shaopeng Wang
DOI:10.1021/jo971368q
日期:1997.12.1
An efficient synthesis of the antimigraine drug candidate avitriptan (1, BMS 180048) is reported. The key step is a two-phase Fischer indolization reaction between hydrazine 6 and 5-chlorovaleraldehyde, 20, to give the chloropropylindole 35, which is susceptible to acid-catalyzed degradation under the reaction conditions required for its formation. Sequential coupling of 35 with piperazine, 26, and 4-chloro-5-methoxypyrimidine, 24, gives the title compound in 40-45% overall yield. Significant improvements in the syntheses of the known starting materials, hydrazine 6, 5-chlorovaleraldehyde, 20, and 4-chloro-5-methoxypyrimidine, 24, were also achieved.
DESLONGCHAMPS, PIERRE;BELANGER, ANDRE;BERNEY, DANIEL J. F.;BORSCHBERG, HA+, CAN. J. CHEM., 68,(1990) N, C. 127-152
作者:DESLONGCHAMPS, PIERRE、BELANGER, ANDRE、BERNEY, DANIEL J. F.、BORSCHBERG, HA+
DOI:——
日期:——
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作者:BARTELS G.
DOI:——
日期:——
Stereoselective Synthesis of Z Fluoroalkenes through Copper-Catalyzed Hydrodefluorination of <i>gem</i>
-Difluoroalkenes with Water
作者:Jiefeng Hu、Xiaowei Han、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201708224
日期:2017.10.16
A copper catalytic system was established for the stereoselective hydrodefluorination of gem‐difluoroalkenes through C−F activation to synthesize various Z fluoroalkenes. H2O is used as the hydrogen source for the fluorine acceptor moiety. This mild catalytic system shows good‐functional group compatibility, accepting a range of carbonyls as precursors to the gem‐difluoroalkenes, including aliphatic
The total synthesis of (+)-ryanodol. Part II. Model studies for rings B and C of (+)-anhydroryanodol. Preparation of a key pentacyclic intermediate
作者:Pierre Deslongchamps、André Bélanger、Daniel J. F. Berney、Hans-Juerg Borschberg、Robert Brousseau、Alain Doutheau、Robert Durand、Hajime Katayama、Richard Lapalme、Dominique M. Leturc、Chun-Chen Liao、Frederick N. MacLachlan、Jean-Pierre Maffrand、Fabrizio Marazza、Robert Martino、Claude Moreau、Luc Ruest、Louiselle Saint-Laurent、Roger Saintonge、Pierre Soucy
DOI:10.1139/v90-022
日期:1990.1.1
This paper reports several model studies that were necessary for the rational conception of a simple four-step synthesis (6 + (S)-74 → 81a–b → 83 87 → 89) (Scheme 11) of the carbonate derivative 8...