Benzyl Alcohol → 6-cyano-3,4-dihydro-2,2-dimethyl-trans-3-hydroxy-4-(4-benzyloxy-2-oxo-3-pyrrolin-1-yl)-2H-1-benzopyran

HRID 358605Notes

Reaction equation

[C:1]([C:3]1[CH:4]=[CH:5][C:6]2[O:11][C:10]([CH3:13])([CH3:12])[C@@H:9]([OH:14])[C@H:8]([N:15]3[CH2:19][C:18]([O:20][CH3:21])=[CH:17][C:16]3=[O:22])[C:7]=2[CH:23]=1)#[N:2].C(O)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1.CS(O)(=O)=O>C(OCC)C>[C:1]([C:3]1[CH:4]=[CH:5][C:6]2[O:11][C:10]([CH3:13])([CH3:12])[C@@H:9]([OH:14])[C@H:8]([N:15]3[CH2:19][C:18]([O:20][CH2:21][C:25]4[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=4)=[CH:17][C:16]3=[O:22])[C:7]=2[CH:23]=1)#[N:2]

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 6-cyano-3,4-dihydro-2,2-dimethyl-trans-3-hydroxy-4-(4-methoxy-2-oxo-3-pyrrolin-1-yl)-2H-1-benzopyran (0.7 g), benzyl alcohol (0.92 ml) and methanesulfonic acid (0.01 g) was heated at 80° C. for 3 hours under reduced pressure (40 mbars). After cooling the residue was stirred with diethylether, and the insoluble product filtered off and washed twice with diethylether, to give 6-cyano-3,4-dihydro-2,2-dimethyl-trans-3-hydroxy-4-(4-benzyloxy-2-oxo-3-pyrrolin-1-yl)-2H-1-benzopyran, m.p. 248° C.

Workup

temperatureAfter cooling the residue
filtrationthe insoluble product filtered off
washwashed twice with diethylether

Sources & evidence

ORD record: ord-2bbd192cd63b4d08959e75f6f1462041
Source dataset: uspto-grants-1991_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04997846

Reaction notes

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