In this paper, on the basis of static stress analysis of the Glider wings, we compare different factors influencing the drag force converted by the glider wings and optimize them by comparing the simulation results with the calculation results. The results shows that the horizontal component force is reach maximum value when attack angle reaches 45°. After that the horizontal component force decreases as attack angle increases. The horizontal component force is gradually increased as the flow rate increases under same attack angle.

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An approach for the solid‐phase synthesis of 4,8‐disubstituted‐8,9‐dihydropyrazino[2,3‐g]quinazolin‐7(6H)‐ones from 4‐chloro‐7‐fluoro‐6‐nitroquinazoline scaffold is described. A chemoselective reaction of resin‐bound arylamines (3) with 4‐chloro‐7‐fluoro‐6‐nitroquinazoline (8) yielded resin‐bound 4‐arylamino‐7‐fluoro‐6‐nitroquinazolines (4), which were reacted with amino acid methyl esters to afford the corresponding resin‐bound compound (5). Following the reduction of nitro group and intramolecular cyclization of 5, resin‐bound 4,8‐disubstituted‐8,9‐dihydropyrazino[2,3‐g]quinazolin‐7(6H)‐one (6) was yielded. The desired products (7) were obtained in good yields and purities after cleavage from the resin. © 2007 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 90: 439–443, 2008.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com

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