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2005
Ring closure reactions
O 0130
An Efficient Synthesis of Benzene Fused Six-, Seven- and Eight-Membered Rings
Nitrogen and Sulfur by Benzyne Ring Closure Reaction. — Benzyne
08- 039 Containing
ring closure reactions are a valuable method for the preparation of six-, seven- and
eight-membered heterocycles possessing nitrogen and sulfur atoms. Although one
might expect the formation of seven- and especially eight-membered rings to be disfavored with respect to entropy considerations, the use of the sterically demanding base
LDA and the non-nucleophilic solvent THF allow the ring closure to occur. —
(MUKHERJEE, C.; BIEHL*, E.; Heterocycles 63 (2004) 10, 2309-2318; Dep.
Chem., South. Method. Univ., Dallas, TX 75275, USA; Eng.) — H. Hoennerscheid
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