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A series of functionalized spiro 1,4-benzoxazine oxindole derivatives were obtained in moderate to good yields via a domino Mannich-alkylation of α-halocarbonyl compounds with imines under mild conditions.
1,1,3,3-Tetramethylguanidine acts as a highly effective catalyst for cyanosilylation of various ketones and aldehydes to the corresponding cyanohydrin trimethylsilyl ethers in up to 99% yield. The reaction proceeds smoothly with 0.1mol% catalyst loading at 25°C under solvent-free conditions.
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