3,4-dihydro-2H-pyran → p-Toluenesulfonic acid

HRID 1846066ノート

反応式

HRID 1846066 の反応式
[CH2:1]([O:3][C:4](=O)[CH2:5][CH2:6][CH2:7]O)C.[CH2:10]1[CH2:15]O[CH:13]=[CH:12][CH2:11]1.CC1(C)C2([CH2:25][S:26]([OH:29])(=[O:28])=[O:27])C(CC1CC2)=O>N1C=CC=CC=1>[CH2:5]1[CH2:4][O:3][CH:1]=[CH:7][CH2:6]1.[CH3:1][C:11]1[CH:12]=[CH:13][C:25]([S:26]([OH:29])(=[O:28])=[O:27])=[CH:15][CH:10]=1

参加物

6

反応物 3

HCID 80803,4-dihydro-2H-pyranHCID 18462Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)-HCID 357772Ethyl 4-hydroxybutanoate

生成物 2

HCID 6101p-Toluenesulfonic acidHCID 80803,4-dihydro-2H-pyran

試薬・触媒・溶媒 1

HCID 1049Pyridine溶媒

実験手順

Scheme 7 depicts the synthesis of intermediate 11e wherein R3 and Y2 are the same and X═Br. Thus, commercially-available 4-hydroxy-butanoic acid ethyl ester 37 is treated with DHP and CSA, or with DHP, TsOH, and pyridine to provide ester 38. Reduction with LiAlD4 affords deuterated alcohol 39, which is treated with either triphenyl phosphine in CCl4 (Sabitha, G et al., Tetrahedron Letters, 2006, (volume date 2007), 48(2): 313-315) or with methanesulfonyl chloride, lithium chloride, and 2,6-lutidine in DMF (Blaszykowski, C et al., Organic Letters, 2004, 6(21): 3771-3774) to afford chloride 40. Following the same methods as in Scheme 6, chloride 40 may be converted to 11e.

出典と根拠

ORDレコード
ord-956b950fd00049ab9c4ecc06b7b2f185
出典データセット
uspto-grants-2015_02
特許番号
US08952016B2

反応ノート

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