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【结 构 式】

【分子编号】36846

【品名】dimethyl (1R,2S,4R,5S)-2-[[(benzyloxy)carbonyl]amino]bicyclo[2.1.1]hexane-2,5-dicarboxylate

【CA登记号】

【 分 子 式 】C18H21NO6

【 分 子 量 】347.36788

【元素组成】C 62.24% H 6.09% N 4.03% O 27.64%

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:(XI)

The cyclization of L-serine (I) with pivalaldehyde (II) by means of LDA in THF gives the oxazolidine (III), which is acylated with formic and acetic anhydride yielding the N-formyloxazolidine (IV). The reaction of (IV) with LDA affords the chiral enol (V), which is treated with allyl bromide in THF to give the chiral 4-allyloxazolidine (VI). Cleavage of the oxazolidine ring with acetyl chloride and treatment with benzyl chloroformate yields the protected chiral 2-allylserine (VII), which is oxidized with oxalyl chloride to the corresponding aldehyde (VIII). The Wittig condensation of (VIII) with triphenylphosphoranylideneacetic acid methyl ester (IX) affords the intermediate (X), which is submitted to UV irradiation with an Hanovia medium pressure mercury lamp through a Pyrex filter in benzene containing benzophenone. A mixture of isomeric bicyclic compounds from which the desired compound (XI) is isolated by column chromatography. The hydrogenation of (IX) with H2 over Pd/C in methanol provides the bicyclic aminoester (XII), which is finally hydrolyzed with 6N HCl.

1 von Diester, S.; et al.; Stereoselektive Alkylierung an C(alpha) von Serin, Glycerinsaure, Threonin und Weinsaure uber heterocyclische Enolate mit exocyclischer Doppelbindung. Helv Chim Acta 1987, 70, 1194-1216.
2 Kozikowski, A.P.; et al.; Synthesis and biology of the conformationally restricted ACPD analogue, 2-aminobicyclo[2.1.1]hexane-2,5-dicarboxylic acid-I, a potent mGluR agonist. J Med Chem 1998, 41, 10, 1641.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
10101 Benzyloxycarbonyl chloride; Benzyl chloroformate; 1-[[(Chlorocarbonyl)oxy]methyl]benzene 501-53-1 C8H7ClO2 详情 详情
11463 3-Bromo-1-propene; 3-Bromopropene;allyl bromide 106-95-6 C3H5Br 详情 详情
(I) 20915 methyl (2S)-2-amino-3-hydroxypropanoate 5680-80-8 C4H9NO3 详情 详情
(II) 19797 Trimethylacetaldehyde; pivalaldehyde; 2,2-Dimethylpropionaldehyde; 2,2-Dimethylpropanal 630-19-3 C5H10O 详情 详情
(III) 36839 methyl (4S)-2-(tert-butyl)-1,3-oxazolidine-4-carboxylate C9H17NO3 详情 详情
(IV) 36840 methyl (4S)-2-(tert-butyl)-3-formyl-1,3-oxazolidine-4-carboxylate C10H17NO4 详情 详情
(V) 36841 lithium [(2R)-2-(tert-butyl)-3-formyl-1,3-oxazolidin-4-ylidene](methoxy)methanolate C10H16LiNO4 详情 详情
(VI) 36842 methyl (2R,4S)-4-allyl-2-(tert-butyl)-3-formyl-1,3-oxazolidine-4-carboxylate C13H21NO4 详情 详情
(VII) 36843 methyl (2S)-2-[[(benzyloxy)carbonyl]amino]-2-(hydroxymethyl)-4-pentenoate C15H19NO5 详情 详情
(VIII) 36844 methyl (2S)-2-[[(benzyloxy)carbonyl]amino]-2-(2-oxoethyl)-4-pentenoate C16H19NO5 详情 详情
(IX) 14689 Methyl (triphenylphosphoranylidene)acetate; (methoxycarbonylmethylene)triphenylphosphorane;Methyl 2-(triphenyl-lambda(5)-phosphanylidene)acetate 2605-67-6 C21H19O2P 详情 详情
(X) 36845 dimethyl (E,4S)-4-allyl-4-[[(benzyloxy)carbonyl]amino]-2-pentenedioate C18H21NO6 详情 详情
(XI) 36846 dimethyl (1R,2S,4R,5S)-2-[[(benzyloxy)carbonyl]amino]bicyclo[2.1.1]hexane-2,5-dicarboxylate C18H21NO6 详情 详情
(XII) 36847 dimethyl (1R,2S,4R,5S)-2-aminobicyclo[2.1.1]hexane-2,5-dicarboxylate C10H15NO4 详情 详情
Extended Information