Table 1. Sequences of precursor peptides and resulting cyclic peptides synthesized in this work.

Entry	Linear peptide	Cyclic peptide	Isolated yield (%)
1a	Phth-Ala-Gly-Gly-m-I-Phe-OMe	2a	62
1b	Phth-Ala-Leu-Gly-m-I-Phe-OMe	2b	55
1c	Phth-Ala-Val-Gly-m-I-Phe-OMe	2c	58
1d	Phth-Ala-Ile-Gly-m-I-Phe-OMe	2d	53
1e	Phth-Ala-Phe-Gly-m-I-Phe-OMe	2e	58
1f	Phth-Ala-Gly-Gly-Ala-m-I-Phe-OMe	2f	62
1g	Phth-Aib-Gly-Gly-m-I-Phe-OMe	2g	52
1h	Phth-Phe-Gly-Gly-m-I-Phe-OMe	2h	19
1i	Phth-Ala-Ser(tBu)-Gly-m-I-Phe-OMe	2i	60
1j	Phth-Ala-Lys(Boc)-Gly-m-I-Phe-OMe	2j	65
1k	Phth-Ala-Asp(OMe)-Gly-m-I-Phe-OMe	2k	65
1l	Phth-Ala-Gly-Gly-m-I-Phe-Gly-Resin	2l	21
1m	Phth-Ala-Gly-Pro-m-I-Phe-OMe	2m	87
1n	Phth-Ala-Gly-Pro-Ala-m-I-Phe-OMe	2n	63
1o	Phth-Ala-Gly-Pro-Ala-p-I-Phe-OMe	2o	50
1p	Phth-Ala-Arg(Pbf)-Gly-Asp(OMe)-m-I-Phe-OMe	2p	23