[4 + 1] Cycloaddition Reactions of o-Thioquinones with Isocyanides: Novel Syntheses of 2-Imino-1,3-Oxathioles - Nair, Vijay; Mathew, Bini; Vinod, A U; Mathen, Joseph Swaroop; Ros, Sindu; Menon, Rajeev S; Varma, R Luxmi; Srinivas, R (Synthesis, 2003)