Tetrahedron Letters

Intramolecular Diels-Alder reactions of benzynes application to the total synthesis of mansonone E

WM Best, D Wege

Index: Best, Wayne M.; Wege, Dieter Tetrahedron Letters, 1981 , vol. 22, # 48 p. 4877 - 4880

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Citation Number: 36

Abstract

Satisfactory elemental analyses have been obtained for this and all other new compounds. 1 H nmr data (90 or 80 MHz CDCl 3 , δ scale): 2 2.40 (d, J 0.6 Hz, 3H, furyl Me), 2.44 (s, 3H, aryl Me), 3.88 (s, 3H, CO 2 Me), 5.00 (s, 2H, CH 2 ), 6.23 (dq, J 3.2, 0.6 Hz, furyl H4), 7.27 (d, J 3.2 Hz, furyl H3), 7.43 and 7.73 (AB q , J AB 8.5 Hz, 2H, aryl); 3 2.30 (d, J 0.8 Hz, 3H, furyl Me), 2.39 (s, 3H, aryl Me), 3.86 (s, 3H, CO 2 Me), 4.10 (m, 4H, acetal), 4.23 (s, 2H, CH 2 ), 5.92 (dq, ...