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The thermal [3 + 2] cycloaddition reaction of N-iminoquiazoline ylides with allenoates worked efficiently under mild reaction conditions to provide a variety of tetrahydropyrazoloquinazoline derivatives in good to excellent yields and moderate to excellent diastereoselectivities.
A multifunctional chiral phosphine‐catalyzed enantioselective [3+2] annulation of Morita–Baylis–Hillman carbonates with barbiturate‐derived alkenes has been achieved under mild conditions, providing a variety of chiral spirobarbiturate‐cyclopentenes in moderate to excellent yields with moderate to excellent diastereo‐ and enantioselectivities.
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