ethyl(4'-chloro-2'-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-1'(2'H)-yl)acetate → (4'-chloro-2'-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-1'(2'H)-yl)acetic acid

HRID 645189Notes

Reaction equation

HRID 645189 reaction equation
C([O:3][C:4](=[O:28])[CH2:5][N:6]1[C:14]2[C:9](=[C:10]([Cl:15])[CH:11]=[CH:12][CH:13]=2)[C:8]2([CH2:19][O:18][C:17]3[CH:20]=[C:21]4[C:25](=[CH:26][C:16]2=3)[CH2:24][CH2:23][O:22]4)[C:7]1=[O:27])C.C(OC(=O)CN1C2C(=CC=CC=2)C2(C3=CC4OCOC=4C=C3OC2)C1=O)C>>[Cl:15][C:10]1[CH:11]=[CH:12][CH:13]=[C:14]2[C:9]=1[C:8]1([CH2:19][O:18][C:17]3[CH:20]=[C:21]4[C:25](=[CH:26][C:16]1=3)[CH2:24][CH2:23][O:22]4)[C:7](=[O:27])[N:6]2[CH2:5][C:4]([OH:28])=[O:3]

Participants

3

Reactant 2

HCID 59263330ethyl(4'-chloro-2'-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-1'(2'H)-yl)acetateHCID 59263415ethyl(2'-oxospiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-1'(2'H)-yl)acetate

Product 1

HCID 59263434(4'-chloro-2'-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-1'(2'H)-yl)acetic acidYield 92%

Procedure

Following the procedure as described in EXAMPLE 2, and making non-critical variations using ethyl(4′-chloro-2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)acetate to replace ethyl(2′-oxospiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-1′(2′H)-yl)acetate, the title compound was obtained in 92% yield as a colorless solid: mp 228-229° C.; 1H NMR (300 MHz, CDCl3) δ 7.26-7.21 (m, 1H), 7.03 (dd, 1H), 6.71 (dd, 1H), 6.52 (s, 1H), 6.36 (s, 1H), 4.93 (dd, 2H), 4.69-4.63 (m, 1H), 4.54-4.51 (m, 3H), 2.95 (t, 2H); 13C NMR (75 MHz, CDCl3) 6177.8, 170.9, 162.1, 162.1, 143.1, 131.7, 130.0, 128.6, 124.7, 119.6, 118.7, 117.0, 106.7, 92.8, 77.2, 72.3, 58.1, 41.2, 28.9; MS (ES−) m/z 370.4 (M−1).

Sources & evidence

ORD record
ord-03c618beea4f4888b85efc2f07fd24a2
Source dataset
uspto-grants-2010_04
Patent number
US07700641B2

Reaction notes

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