The Use of Glycidyl Ethers Involving Aziridinium Intermediates and Other Methodology for the Preparation of Enantiomerically Pure Drug Candidates
作者:Timothy A. Ayers、Timothy J. N. Watson、Witold Subotkowski、John Daniel、Mark Webster
DOI:10.1021/op200310y
日期:2012.1.20
2-amine migration process through an aziridinium intermediate involving ring-opening with potassium phthalimide derivatives to produce precursors to drug candidates was developed. The precursor amine derivatives were readily available by epoxide opening of simple glycidyl ether derivatives. The regioselectivity of the process was shown to provide approximately 85% of the desired rearranged product with
Facile Preparation of 3-(1-Piperazinyl)-1H-indazoles
作者:Vincent Leroy、George E. Lee、Jiang Lin、Sandra H. Herman、Thomas B. Lee
DOI:10.1021/op0002242
日期:2001.3.1
Pre-clinical evaluation of a potential antipsychotic agent required a convenient synthesis of 3-(1-piperazinyl)-1H-indazole derivatives. Improvements of the original preparation provided a five-step sequence to an unsubstituted piperazine intermediate, with a 67% overall yield. All intermediates were isolated by filtration.