Dicyclohexylcarbodiimide → Benzyl 6-(3-hexyl-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl-carbonyloxy)-nicotinate

HRID 1633

Reaction equation

[CH2:1]([C:7]1[C:8]([C:21]([OH:23])=[O:22])=[CH:9][C:10]2[C:11]([CH3:20])([CH3:19])[CH2:12][CH2:13][C:14]([CH3:18])([CH3:17])[C:15]=2[CH:16]=1)[CH2:2][CH2:3][CH2:4][CH2:5][CH3:6].O[C:25]1[CH:40]=[CH:39][C:28]([C:29]([O:31][CH2:32][C:33]2[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=2)=[O:30])=[CH:27][N:26]=1.C1(N=C=NC2CCCCC2)CCCCC1>C(Cl)Cl.CN(C)C1C=CN=CC=1>[CH2:1]([C:7]1[C:8]([C:21]([O:23][C:25]2[CH:40]=[CH:39][C:28]([C:29]([O:31][CH2:32][C:33]3[CH:34]=[CH:35][CH:36]=[CH:37][CH:38]=3)=[O:30])=[CH:27][N:26]=2)=[O:22])=[CH:9][C:10]2[C:11]([CH3:20])([CH3:19])[CH2:12][CH2:13][C:14]([CH3:17])([CH3:18])[C:15]=2[CH:16]=1)[CH2:2][CH2:3][CH2:4][CH2:5][CH3:6]

Participants

Conditions

Temperature: 0 °C

Procedure

6 g of 3-hexyl-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl-carboxylic acid were dissolved in 180 ml of methylene chloride. After the addition of a solution of 4.8 g of benzyl 6-hydroxy-nicotinate in 160 ml of methylene chloride and of 2.3 g of 4-dimethylaminopyridine, the solution was cooled to 0° C. and treated with 4.4 g of dicyclohexylcarbodiimide. The reaction mixture was stirred at 0° C. for 1 hour and at room temperature for 2 hours, thereafter poured into ice-cold aqueous ammonium chloride solution, extracted several times with ether, washed with water, dried over sodium sulfate and evaporated. The crude product, for the most part crystalline, was filtered over silica gel (eluent hexane/ethyl acetate=9:1) and recrystallized from hexane. After repeated crystallization of the mother liquor there were obtained all together 5.7 g of benzyl 6-(3-hexyl-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl-carbonyloxy)-nicotinate in colorless crystals, m.p. 94°-95° C.

Workup

additionpoured into ice-cold aqueous ammonium chloride solution
extractionextracted several times with ether
washwashed with water
dry with materialdried over sodium sulfate
customevaporated
filtrationThe crude product, for the most part crystalline, was filtered over silica gel (eluent hexane/ethyl acetate=9:1)
customrecrystallized from hexane
customcrystallization of the mother liquor

Sources & evidence

ORD record: ord-c4710f63ab8144a9acdfc1350b467c98
Source dataset: uspto-grants-1998_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05726191

Linked notes

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