[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][N:2]=1.[CH3:11][O:12]/[C:13](=[CH:19]/[C:20](=[CH2:26])[O:21][Si](C)(C)C)/[O:14][Si](C)(C)C.Cl[C:28]([O:30][CH2:31][C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)=[O:29].[NH4+].[Cl-]>C(Cl)Cl>[CH3:11][O:12][C:13](=[O:14])[CH2:19][C:20](=[O:21])[CH2:26][CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][N:2]1[C:28]([O:30][CH2:31][C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)=[O:29]To the mixture of isoquinoline (24) (2.05 g, 15.9 mmol) in 150 mL of CH2Cl2 at 0° C. was added (Z)-4-methoxy-2,2,8,8-tetramethyl-6-methylene-3,7-dioxa-2,8-disilanon-4-ene (25) (8.29 g, 31.8 mmol), followed by benzyl chloroformate (2.7 mL, 19.1 mmol). After stirring at room temperature overnight, 100 mL of NH4Cl (aq) was added to the mixture. The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The combined organic extracts were dried over Na2SO4. After the desiccant was filtered off, the organic extracts were concentrated under reduced pressure to provide (26) as a yellow oil (6.73 g). 1H NMR indicated about a 1:2 ratio of keto:enol tautomers. This crude oil was used in the next reaction without further purification.
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