short stereocontrolled synthesis of trans and cis-tetrahydro-pyrazinoisoquinolinediones

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2003 Pyrazine derivatives Pyrazine derivatives R 0550 Short Stereocontrolled Synthesis of trans and cis-Tetrahydro-pyrazinoisoquinolinediones. — Synthesis of the trans-tetrahydro-pyrazinoisoquinolinedione (IV) involves N-alkylation followed by Pictet—Spengler cyclization as the steps. The cis-isomer (VI) is obtained by epimerization of (IV) via the unsaturated compound (V). — (GONZALEZ, J. F.; DE LA CUESTA, E.; AVENDANO*, C.; Tetrahedron Lett. 44 (2003) 23, 4395-4398; Dep. Quim. Org. Farm., Fac. Farm., Univ. Complutense, E-28040 Madrid, Spain; Eng.) — Roy 36- 129

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Page 1: Short Stereocontrolled Synthesis of trans and cis-Tetrahydro-pyrazinoisoquinolinediones

2003 Pyrazine derivatives

Pyrazine derivativesR 0550 Short Stereocontrolled Synthesis of trans and cis-Tetrahydro-pyrazinoisoquino-

linediones. — Synthesis of the trans-tetrahydro-pyrazinoisoquinolinedione (IV)involves N-alkylation followed by Pictet—Spengler cyclization as the steps. The cis-isomer (VI) is obtained by epimerization of (IV) via the unsaturated compound (V). — (GONZALEZ, J. F.; DE LA CUESTA, E.; AVENDANO*, C.; Tetrahedron Lett. 44 (2003) 23, 4395-4398; Dep. Quim. Org. Farm., Fac. Farm., Univ. Complutense, E-28040 Madrid, Spain; Eng.) — Roy

36- 129

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