Ketene dithioacetals alkynylsilane cyclization reactions

Ketene dithioacetals have also been used as initiators for alkynylsilane-terminated cyclization reactions. Treatment of the thioacetal (86) with trifluoroacetic acid gave the bicyclic ketodithioketal (87) in 76% yield. In this reaction the protonated ketene dithioacetal functions as an acylium ion equivalent, which is trapped by the nucleophilic alkynylsilane. 

---

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

---