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【结 构 式】

【分子编号】56907

【品名】(2S)-2-[(trityloxy)methyl]-3,6-dihydro-2H-pyran; (2S)-3,6-dihydro-2H-pyran-2-ylmethyl trityl ether

【CA登记号】

【 分 子 式 】C25H24O2

【 分 子 量 】356.46436

【元素组成】C 84.24% H 6.79% O 8.98%

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:(VI)

The intermediate (S)-3-(2-mesyloxyethoxy)-4-(triphenylmethoxy)-1-butanol mesylate (VIII) has been obtained as follows: The hetero Diels Alder cyclization of ethyl glyoxylate (I) with butadiene (II) in toluene at 160-70 C gives racemic 3,6-dihydro-2H pyran-2-carboxylic acid ethyl ester (III), which is submitted to enzymatic resolution by means of B.lentus protease, yielding a mixture of the hydrolyzed (R)-acid and unchanged (S)-ester (IV), that is easily separated. The reduction of the (S)-ester (IV) by means of LiAlH4 in THF affords the hydroxymethyl derivative (V), which is treated with Tr-Cl and DMAP in pyridine to provide the trityl ether (VI). Ozonolysis of the dihydropyran ring of (VI) by means of ozone and NaBH4 in dichloromethane/methanol gives (S)-3-(2-hydroxyethoxy)-4-(triphenylmethoxy)-1-butanol (VII). Finally this compound is treated with Ms-Cl and TEA in dichloromethane to yield the target intermediate (S)-3-(2-mesyloxyethoxy)-4-(triphenylmethoxy)-1-butanol mesylate (VIII). (see scheme no. 25239601a, intermediate no. (X).

1 Caille, J.C.; Hetero diels-alder-biocatalysis approach for the synthesis of (S)-3-[2-{(methylsulfonyl)oxy}ethoxy]-4- (triphenylmethoxy)-1-butanol sulfonate, a key intermediate for the synthesis of the PKC inhibitor LY333531. Org Process Res Dev 2002, 6, 4, 471.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 48591 Ethyl glyoxylate; Ethyl oxoacetate; Glyoxylic acid ethyl ester 924-44-7 C4H6O3 详情 详情
(II) 11579 1,3-Butadiene; Butadiene 106-99-0 C4H6 详情 详情
(III) 56904 ethyl 3,6-dihydro-2H-pyran-2-carboxylate C8H12O3 详情 详情
(IV) 56905 ethyl (2S)-3,6-dihydro-2H-pyran-2-carboxylate C8H12O3 详情 详情
(V) 56906 (2S)-3,6-dihydro-2H-pyran-2-ylmethanol C6H10O2 详情 详情
(VI) 56907 (2S)-2-[(trityloxy)methyl]-3,6-dihydro-2H-pyran; (2S)-3,6-dihydro-2H-pyran-2-ylmethyl trityl ether C25H24O2 详情 详情
(VII) 41010 (3S)-3-(2-hydroxyethoxy)-4-(trityloxy)-1-butanol C25H28O4 详情 详情
(VIII) 41011 (3S)-3-[2-[(methylsulfonyl)oxy]ethoxy]-4-(trityloxy)butyl methanesulfonate C27H32O8S2 详情 详情
Extended Information