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【结 构 式】

【分子编号】35024

【品名】methyl 3-(4-methylcyclohexyl)-3-oxopropanoate

【CA登记号】

【 分 子 式 】C11H18O3

【 分 子 量 】198.26212

【元素组成】C 66.64% H 9.15% O 24.21%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(III)

Condensation of piperonal (I) with nitromethane in the presence of NaOH provided nitrostyrene (II). Subsequent conjugate addition of (II) to ketoester (III) using DBU provided adduct (IV). Reduction of the nitro group of (IV), with concomitant ring closure formed the cyclic imine (V), which was reduced with NaBH3CN to yield the pyrrolidine (VI) as a diastereomeric mixture. The crude mixture was isomerized to a mixture of only cis,trans and trans,trans pyrrolidines (VII) by base-catalyzed equilibration with NaOEt. N-Alkylation of the pyrrolidines (VII) with N,N-dibutyl bromoacetamide (VIII) furnished (IX). Basic hydrolysis of the ester group of (IX) with either NaOH or LiOH gave rise to the target trans,trans pyrrolidine-3-carboxylic acid. The undesired cis,trans isomeric ester (X) was not hydrolyzed under these conditions, allowing its removal from the product by means of differential extraction.

1 Boyd, S.A.; Mantei, R.A.; Tasker, A.S.; et al.; Discovery of a series of pyrrolidine-based endothelin receptor antagonists with enhanced ETA receptor selectivity. Bioorg Med Chem 1999, 7, 6, 991.
2 Winn, M.; Boyd, S.A.; Hutchins, C.W.; Tasker, A.S.; Von Geldern, T.W.; Kester, J.A.; Sorensen, B.K.; Szczepankiewicz, B.G.; Henry, K.J. Jr.; Liu, G.; Wittenberger, S.J.; King, S.A. (Abbott Laboratories Inc.); Novel benzo-1,3-dioxolyl- and benzofuranyl substd. pyrrolidine derivs. as endothelin antagonists. EP 0885215; WO 9730045 .
3 Jae, H.-S.; Hutchins, C.W.; Szczepankiewicz, B.G.; King, S.A.; Winn, M.; Boyd, S.A.; Henry, K.J.; Geldern, T.W.; Wittenberger, S.J.; Tasker, A.S.; Sorensen, B.K.; Kester, J.A. (Abbott Laboratories Inc.); Endothelin antagonists. WO 9906397 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
39563 nitromethane 75-52-5 CH3NO2 详情 详情
(VIIa) 35028 methyl (2S,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate C20H27NO4 详情 详情
(VIIb) 35029 methyl (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate C20H27NO4 详情 详情
(IXa) 35030 methyl (2S,3R,4S)-4-(1,3-benzodioxol-5-yl)-1-[2-(dibutylamino)-2-oxoethyl]-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate C30H46N2O5 详情 详情
(IXb),(X) 35031 methyl (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-1-[2-(dibutylamino)-2-oxoethyl]-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate C30H46N2O5 详情 详情
(I) 10127 1,3-Benzodioxole-5-carbaldehyde; Heliotropine 120-57-0 C8H6O3 详情 详情
(II) 20675 5-[(E)-2-nitroethenyl]-1,3-benzodioxole 1485-00-3 C9H7NO4 详情 详情
(III) 35024 methyl 3-(4-methylcyclohexyl)-3-oxopropanoate C11H18O3 详情 详情
(IV) 35025 methyl 3-(1,3-benzodioxol-5-yl)-2-[(4-methylcyclohexyl)carbonyl]-4-nitrobutanoate C20H25NO7 详情 详情
(V) 35026 methyl 3-(1,3-benzodioxol-5-yl)-5-(4-methylcyclohexyl)-3,4-dihydro-2H-pyrrole-4-carboxylate C20H25NO4 详情 详情
(VI) 35027 methyl 4-(1,3-benzodioxol-5-yl)-2-(4-methylcyclohexyl)-3-pyrrolidinecarboxylate C20H27NO4 详情 详情
(VIII) 20685 2-Bromo-N,N-dibutylacetamide; N,N-Dibutylbromoacetamide C10H20BrNO 详情 详情
Extended Information