论文信息 - Elemental iodine catalyzed [4 + 2] cycloaddition reactions of o-quinomethanes: an efficient synthesis of trans-fused pyrano[3,2-c]benzopyrans

Elemental iodine catalyzed [4 + 2] cycloaddition reactions of o-quinomethanes: an efficient synthesis of trans-fused pyrano[3,2-c]benzopyrans

Elemental iodine has been utilized as an efficient catalyst for the intramolecular[4 + 2]cycloaddition of o-quinomethanes generated in situ from o-hydroxybenzaldehydes and unsaturated alcohol in the presence of trimethyl orthoformate to afford the corresponding trans-annelated pyrano[3,2-c]benzopyrans in high yields with high diastereoselectivity

J. Yadav | B. Reddy | C. Rao | K. V. Rao

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