The Swern Oxidation: First example of direct oxidation of 2-pyrazolines with “activated” DMSO
摘要:
1,3-Dipolar cycloaddition of 2-diazopropane to conjugated dienes 1 and α,β-unsaturated ketones 5 is taking place regiospecifically to give cycloadduit 4 and 6.在 Swern 条件下,2-吡唑啉衍生物与二甲基亚砜和草酰氯反应生成吡唑啉 7 和 8。