Ethyl chloroformate → Tris(8-ethoxycarbonyl-2,2,6,6-tetramethylbenzo[1,2-d:4,5-d']-bis(1,3)dioxole-4-yl)methane

HRID 400280Notes

Reaction equation

[CH3:1][C:2]1([CH3:49])[O:6][C:5]2[C:7]([CH:16]([C:33]3[C:43]4[O:44][C:45]([CH3:48])([CH3:47])[O:46][C:42]=4[CH:41]=[C:35]4[O:36][C:37]([CH3:40])([CH3:39])[O:38][C:34]=34)[C:17]3[C:27]4[O:28][C:29]([CH3:32])([CH3:31])[O:30][C:26]=4[CH:25]=[C:19]4[O:20][C:21]([CH3:24])([CH3:23])[O:22][C:18]=34)=[C:8]3[O:12][C:11]([CH3:14])([CH3:13])[O:10][C:9]3=[CH:15][C:4]=2[O:3]1.[Li]CC[CH2:53][CH3:54].[CH2:55]([O:57][C:58](Cl)=[O:59])[CH3:56]>C1COCC1>[CH2:55]([O:57][C:58]([C:41]1[C:35]2[O:36][C:37]([CH3:40])([CH3:39])[O:38][C:34]=2[C:33]([CH:16]([C:17]2[C:18]3[O:22][C:21]([CH3:23])([CH3:24])[O:20][C:19]=3[C:25]([C:11]([O:12][CH2:53][CH3:54])=[O:10])=[C:26]3[O:30][C:29]([CH3:31])([CH3:32])[O:28][C:27]=23)[C:7]2[C:5]3[O:6][C:2]([CH3:49])([CH3:1])[O:3][C:4]=3[C:15]([C:2]([O:3][CH2:4][CH3:5])=[O:6])=[C:9]3[O:10][C:11]([CH3:13])([CH3:14])[O:12][C:8]=23)=[C:43]2[C:42]=1[O:46][C:45]([CH3:48])([CH3:47])[O:44]2)=[O:59])[CH3:56]

Participants

Conditions

Temperature: -60 °C

Procedure

Tris(2,2,6,6-tetramethylbenzo[1,2-d:4,5-d']-bis(1,3)dioxole-4-yl)methane (1.35 g, 2.0 mmol (Example 17)) was dissolved in dry THF (400 mL) under N2, and the temp was lowered to -40° C. and n-BuLi (4.86 mL, 12.2 mmol) was added and the temperature was allowed to rise gradually to 0° C. The mixture was cooled to -60° C., and a solution of ethylchloroformate (4.0, 36.7 mmol) in THF (50 mL) was added. The reaction mixture was left overnight and worked up as described under Example 20 above. The chromatography gave (0.41 g, 24%) of tris(8-ethoxycarbonyl-2,2,6,6-tetramethylbenzo[1,2-d:4,5-d']-bis(1,3)dioxole-4-yl)methane.

Workup

customwas lowered to -40° C.
customto rise gradually to 0° C

Sources & evidence

ORD record: ord-1597a8428c5a45598998ab6a074da8c8
Source dataset: uspto-grants-1998_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05827501

Reaction notes

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