A convenient method for synthesis of trans-4-cyclohexyl-l-proline
摘要:
A convenient rnethod for the synthesis of the fosinopril precursor, trans-4-cyclohexyl-L-proline 1. has been developed. A highly stereoselective alkylation of N-benzyl-pyroglutamic acid 2 with 3-bromocyclohexene at -10degreesC and subsequent hydrogenolysis afforded the trans-4-cyclohexyl-L-pyroglutamic acid 4. The esterified 4 was sulfurized with Lawesson's reagent, desulfurized with Raney-Ni and hydrogenolytic cleavage of the benzyl protecting groups to afford 1 with 93% e.e. (C) 2002 Elsevier Science Ltd. All rights reserved.
A convenient method for synthesis of trans-4-cyclohexyl-l-proline
摘要:
A convenient rnethod for the synthesis of the fosinopril precursor, trans-4-cyclohexyl-L-proline 1. has been developed. A highly stereoselective alkylation of N-benzyl-pyroglutamic acid 2 with 3-bromocyclohexene at -10degreesC and subsequent hydrogenolysis afforded the trans-4-cyclohexyl-L-pyroglutamic acid 4. The esterified 4 was sulfurized with Lawesson's reagent, desulfurized with Raney-Ni and hydrogenolytic cleavage of the benzyl protecting groups to afford 1 with 93% e.e. (C) 2002 Elsevier Science Ltd. All rights reserved.